White Screen Flash (During Runtime)

[Nick]

Dear David,

That is an extremely valid point, and I'm glad you replied back and posed 
that question. I programmed the majority of this task, but my in-house 
programmer added the 'Clear Screen' and 'Wait' object later on. I'm waiting 
to hear back from him to understand the rationale behind his decision to do 
so. If anything, you could easily argue that there are two objects being 
used for a single function, which in this case, would be redundant. I'll 
re-post when I hear back, but in the meantime, thank you again highlighting 
a piece of the task structure that may be inefficient (for lack of a better 
word).

Sincerely,

Nick

On Monday, March 17, 2014 1:55:35 PM UTC-4, McFarlane, David wrote:
>
> Nick, 
>
> Thanks for reporting back, and glad that you got it sorted out.  Hmm, 
> now you got me curious -- if you want to clear the screen and then 
> wait 3 s, why not just have a blank TextDisplay object with a 
> Duration of 3000 (instead of a 0 s TextDisplay followed by a 3000 ms 
> Wait object)? 
>
> Thanks, 
> -- David McFarlane 
>
>
> At 3/17/2014 12:40 PM Monday, Nick wrote: 
> >Edit: The video card has 128mb of RAM, not the PC running E-Prime. 
> > 
> > 
> > 
> >On Monday, March 17, 2014 12:37:00 PM UTC-4, Nick wrote: 
> >Dear David, 
> > 
> >I believe, together with PST technical support, that we've resolved the 
> issue. 
> > 
> >Here's a brief list of the steps we took to remedy the issue: 
> > 
> >1) The computer running the program was connected to a local area 
> >network. While I run the program from the C:\ drive as a means to 
> >avoid network failure, I was unaware that being connected to a 
> >network could interfere with timing and other issues (i.e., 
> ><http://pstnet.com/support/kb.asp?TopicID=5555>
> http://pstnet.com/support/kb.asp?TopicID=5555). 
> > 
> >2) I removed the ethernet cable from the machine running the flanker 
> task. 
> > 
> >3) I also modified two objects that were in the original file, which 
> >can be viewed via the attached screen cap. 
> > 
> >        a. ClearScreen Text Display Object: Previously set to 0; 
> > changed to 10ms. With a prior duration of 0, the object was 
> > technically still on the screen for a single-screen refresh, which 
> > is around 16ms. 
> > 
> >        b. Wait3Seconds Object: Changed the properties - More 
> > specifically, I changed the onset sync property from "vertical 
> > blank" to "none." 
> > 
> > 
> >After making these modifications, the issue *knock on wood* appears 
> >to have been resolved. I was concerned that it was a video card 
> >issue as the machine we're using is older and only has 128mb of RAM 
> >(although these specifications appear adequate for the version of 
> >E-Prime we're using 1.2). 
> > 
> > 
> >-Nick 
> > 
> >On Thursday, March 13, 2014 3:41:01 PM UTC-4, McFarlane, David wrote: 
> >Nick, 
> > 
> >You should definitely take this up with PST Support 
> >(<https://support.pstnet.com>https://support.pstnet.com ), if you 
> >have not already.  And then 
> >please report back here with the results. 
> > 
> >Thanks, 
> >-- David McFarlane 
> > 
> > 
> >At 3/12/2014 02:38 PM Wednesday, Nick wrote: 
> > >I've recorded a video of the presence of the white screen, and have 
> > >provided a link to the file that is stored by Dropbox. 
> > > 
> > ><<https://www.dropbox.com/s/npm678rb28vnzu6/ch04-01.avi>https://www 
> > .dropbox.com/s/npm678rb28vnzu6/ch04-01.avi>
> https://www.dropbox.com/s/npm678rb28vnzu6/ch04-01.avi 
> > 
> > > 
> > >It occurs at trial 
> > <<https://support.pstnet.com/requests/395>
> https://support.pstnet.com/requests/395>#395 
> > of 
> > >the third test block of "IncOrder" 
> > <<https://support.pstnet.com/requests/6>
> https://support.pstnet.com/requests/6>#6. 
> > 
> > > 
> > >It appears to occur after the offset of the flanker array and before 
> > >the presentation of visual feedback. 
> > > 
> > >Could this be a hardware issue? 
> > > 
> > > 
> > >-Nick 
> > > 
> > > 
> > >On Tuesday, March 4, 2014 5:43:41 PM UTC-5, Nick wrote: 
> > >Dear All, 
> > > 
> > >I'm hoping to receive some guidance on a strange bug in my E-Prime 
> task. 
> > > 
> > >Here's a brief description of the program: 
> > > 
> > >1. An arrowhead version of the flanker task that consists of 4 
> > >different stimuli (<<<<<, >>>>>, <<><<, >><>>). 
> > >2. The flanker stimuli are presented in white text against a black 
> > >background. 
> > >3. There are 3 test blocks that each contain 400 trials and the 
> > >participant responds using the SRBox. 
> > >4. The task is administered while EEG is continuously recorded. 
> > >5. Each test block lasts for 20 minutes. The total task takes 60 
> minutes. 
> > > 
> > >Here's a brief description of the problem(s): 
> > > 
> > >1. Each time I run the task, there is one isolated instance where 
> > >the screen briefly turns white for no more than 300ms. 
> > > 
> > >2. The program continues to run after this occurs and the script 
> > >always terminates successfully. 
> > > 
> > >3. There is no pattern as to when this occurs (e.g., could be 5 
> > >minutes in to the task or 15 minutes) and does not appear to be 
> > >specific to a certain trial # or test block. 
> > > 
> > >Miscellaneous Troubleshooting: 
> > > 
> > >1. I've checked the power settings on the CRT monitor that is used 
> > >to present the stimuli. The hard drive and monitor have been set to 
> > >never go on standby or go to sleep. 
> > >2. The script always compiles without any errors. 
> > >3. There are no unreferenced E-objects. 
> > >4. Participants do not have access to the keyboard that is used to 
> > >execute the task (I viewed several threads (and the PST website) 
> > >commenting on how this could be triggered by the windows start 
> > >button on the keyboard)). 
> > >5. I initially thought this could represent a run-time error, but it 
> > >seems strange to me that it would self-correct and resume. 
> > > 
> > > 
> > >Any thoughts/comments would be much appreciated. 
> > > 
> > >-Nick 
>
>

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